Figure 3

Frequency distributions of estimated ages of female (n = 238; A) and male (n = 143; B) P. downsi flies captured at a lowland site on Santa Cruz Island, Galapagos from February 2015 through March 2016. The vertical dotted line marks 210 days, which corresponds to the length of a typical interbreeding season, during which host availability for P. downsi is low.